at those bombs were detonated remotely, possibly, by a cell phone. >> marci, the tragedy here is insurmountable. when you talk about an 8-year-old boy among one of the victims. there were hundred of victims rushed to local hospitals. what are you hearing abut those who survived these bombs? >> yeah, we are hearing more than 140 people were injured. and many of those injuries as you can imagine, absolutely catastrophic. we're told dozens of people lost limbs. so many people are suffering from really severe shrapnel wounds. we are also hearing that one of the youngest people injured in this was just 2 years old. and is being treated in the hospital here in boston this morning. john, diana. >> abc's marci gonzalez, reporting live from boston this morning. thank you. well so many of those hurt in the bomb blast have suffered

what are cat gorized as traumatic injuries. the majority of injuries caused by shrapnel hitting victim's lowers body. last night we spoke to a doctor here in new york city with years of trauma experience. >> one of the thing that all hospitals of that size in particular have in place is a disaster plan the we practice these a few times of year, do it here in new york at least every six months. though plans have in place mock exercises. we have put our resources into play. we have fake patients come into the hospital. so, having run those exercises repeatly gives you some preparation. this is completely unexpected. no matter how good your plan is, you will be overwhelmed. you are going to be dealing with a huge volume of patients with a wide spectrum of injuries not an easy thing to handle. i have to admit what tie have seen, an amazing job, from a blast, can cause severe burns, an injury that takes a long time to heal, requires multiple operations interventions. but fractures and traumatic

amputations are the most traumatic thing. what kills people is the closed head injuries. the blast effect itself will shake the brain so much it can cause instantaneous or delayed death. >> one quote about the injuries suffered in the bombings from chief of emergency services at massachusetts general hospital. he said the amount of carnage is what is expected from a war zone. >> the boston marathon one of the world's if not the most prestigious marathon. more than 23,000 started the race. at the time of explosions, 17,000 crossed the finish line. one was 33-year-old rebecca roche from there in boston. >> i had a bad feeling when i saw the smoke. and after hearing the noise, hearing the second one. it is the boston marathon. one of the world's marathons. at the finish line. i suspected it was terrorism. there was a moment of -- what should have been joy and turned

it into panic. and just heartwrenching fear of the worst. >> roche ran the race with the word mom and dad on her legs. her mother and friend were badly injured. she told terry moran she feels guilty, if she wasn't running they wouldn't have been hurt. >> president obama is vowing those responsible for the bombing will feel the full weight of justice. and the commander-in-chief promised all federal resources at hand. >> i have also spoken with governor patrick and mayor menino and made it clear they have every single federal resource necessary to care for victims and counsel the families. an that all americans stand with the people of boston. >> the white house says the attack is being treated as an act of terrorism. >> in washington, lawmakers observed a moment of silence. moments after getting word about the boston explosions at the capitol, flags low lowered to

half staff. house speaker boehner, said while this is a terrible day the american spirit will help us carry on. our coverage of the terror at the boston marathon does not end here. later this half-hour, the banner headlines from the newspapers worldwide, covering the developing story. stay with us us abc news and abc news.com all day long. >> to other major headlines we are following this morning the a plan to reform the nation's immigration system will be introduced to day on capitol hill. it include $1.5 billion for border fences and billions more for security improvements along the u.s.-mexico border and would put millions of illegal immigrants on a path to citizenship if they arrive before end of 2011. extraordinary security measures were in place for margaret thatcher's funeral tomorrow in london. now those are being stepped up even more. hundreds of british troops have taken part in a full-scale rehearsal for the elaborate service which features a procession through the streets. queen elizabeth and world leaders set to attend.

15 months after the grounding of a cruise ship, prosecutors want the captain to stand trial for manslaughter. he is accused of causing the wreck and abandoning the ship before all passengers got off safety. he said four senior crew members should be charged with delaying the evacuation. let's take a quick look at your tuesday forecast now. morning showers from seattle to portland. snow in the cascades. rockies and dakotas. severe storms, with hail and gusty wind. from texas to st. louis. nashville and cincinnati. afternoon showers from pittsburgh to northern new england. >> mid 60s in the northeast. 80s from dallas to miami. 40s in the middle of the country. 70 in sacramento. coming up returning to our top story -- the tragedien boston. see how the bombing scene was quickly transformed last night. >> later on we will explore a so-called april curse. why so many tragedies happen

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returning to our top story, terror at the boston marathon. our affiliate in boston, wcvb has been working tirelessly since the explosions want off hours ago. >> the on the scene triage unit turned into an investigation hub as we see from wcvbs 11:00 p.m.

newscast last night. >> earlier today we had been told there had been a lot of calls to police with people concerned about suspicious packages. those are being checked out. behind us you can see the area which is now a crime scene and probably the center of the investigation, where all of the different law enforcement agencies are gathering. that's where the medical tent was and is now turned into the headquarters as it were of the investigation. right next to me you can also see that as the marathoners have left, the international media and national media moved in. these folks from fuji television in japan. also folks here from german television, i have also spoken to folks from latin american television. reporter from colombia. obviously this has become a national/international event. and i also did get a chance earlier this evening off to talk to folks who have the vantage

point of being right there, right in front of the blast scene by the finish line. let's hear what they had to say. >> suddenly this big explosion took place in front of me. and then i saw this cloud, big cloud, with smoke. and my first instinct was to run across the street and start helping out the people. >> your sleeve there is that blood on your sleeve? >> my pants. my clothes. >> show me the flag. >> that was the flag i was holding the whole type. this is how the flag ended up, carrying the blood, all these victims. >> you turn around and see smoke rising. smoke and debris everywhere. across the finish line. screams. people running. and it doesn't make sense to me. >> my niece thought it was a cannon. a couple second later we saw it on the next block. we were paralyzed. didn't know go left, right. >> what did you do? >> the cop kept telling us you got to got out. clear out. >> great job.

wcvb in boston. what a day they've had. what a day this morning. starts all over. great work. >> just a portion of the 11:00 p.m. newscast. you weren't able to see all the information. there is more information everybody needs to know in boston headed to boston. the crime scene, perimeter is in the back bay, a large expansive area. police like i said now a crime scene. there are buildings inaccessible. mass transit inaccessible and lots of streets. everybody that lives there or works there has been transferred to shelters or told to go to a different place to report to work if they have to report to work tomorrow. that is according to the may your's office. >> big press conference scheduled for 9:30 in the morning. that's when the whole nation will get the latest on this. a lot of things happening overnight. lot of tweeting. five miles from boston. an apartment that local police and fed have been checking out. no confirmation it is connected. you half to think something is up there. at this 9. 30. press conference get the latest

and encouraging information who did this and why they may have bun this. >> lots of police presence, comes with the territory when this kind of thing happens. >> no doubt. still to come -- coincidence or something more? >> why investigators may be looking closely at date of the attack, at the boston marathon. stay with us.

as investigators try to figure out who may have set off the bombs in the boston marathon. one of the things they'll beçl$ looking at the timing of the attack. >> abc consultant is a veteran of the fbi here is what he told our diane sawyer about why the

date of this bombing may be significant. >> you are in that window of april 15 to april 20 when we have had a number of domestic extremist events. oklahoma city, columbine, virginia tech, some people say that they are driven to a certain extent because hitler's birthday is on april 20th. i'm not suggesting that is connected to this, merely throwing it out it will not surprise me if this is some local extremist group trying to make a statement because of this particular day. i'm not suggesting the window need to be narrow. but i would look intensely at what information they had about different extremist groups. there is a lot of public source information about demonstrations on taxes, on, on a number of other issues that are, hot button issues for extremist groups who don't like either what the government is doing or what the government represents. >> very interesting. >> so. >> tax day/patriots day.

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all right. the world wakes up today, the terror at the boston marathon. beg front line headlines on newspapers worldwide. >> we're going to take a look at some of them now. these are advance copies of what you will see tomorrow morning depending on where you live. the first one, the boston herald, it says, terror at the finish line. this is one of the harrowing pictures, the flags, the ominous flags, the only thing you can

see. everything behind it smoke. and that's where one of the explosions happened. that's where you have been seeing a lot of the videos. all the people that were there were injured. is what we are hearing now. >> wow. take a look at "the new york times" right here the a tough one to look at. >> tough one to look at. dramatic picture of heroes. looks like a joe blow guy. ran up and helped people. after the bomb went off. people ran toward people injured. instead of running away. true heroes. blast at boston marathon kills three injuries 100. >> something else very interesting about this. how fluid this information is. the same picture. the "boston globe." another one of the very similar image as "the new york times" that you just saw. but this will say, bomb at the finish line killed three. injured 130. that's how you know the information is still coming in. even the news pap

even the news paapers printing e latest edition their information is fluid. >> the guardian, worldwide headline. dramatic picture, the runner who fell down, 70-something runner blasted off his feet. >> totally fine. >> twin blast hits city marathon. the daily telegraph, bomb carnage at the marathon. a wider shot. a little more, don't know if you can to the word tasteful. little less bloody. >> isn't it interesting. there were so many cameras, such an incredible event. so many cameras, still cameras and television cameras and cameras that were recording live video, and they were able to capture the moment where you can still see the fire. that is the moment where that actually happened. some of the other pictures are later. >> go to the infamous. >> "the new york post." because they, they're known for some of their headlines. they're known for, you know going places where a lot of the other newspapers prefer to not go to. what they did, they kept it simple. terror at the top.

the picture gruesome. lots of blood around the young lady. >> the stunned look. says a lot. >> is does tell the story. >> looks shell shocked. truly. >> some of the head lines you will be seeing as you wake up.

terror at the boston marathon. twin explosions shatter celebration turning a day of joy into a deadly nightmare. >> i literally saw the garbage barrel explode. i saw a flash of fire, the smoke. i ran as fast as i could. >> the finish line of the iconic event a scene of horror. >> i looked over and saw just a pile of bodies, the worst thing i have ever seen in my life.=mx this morning, fierce resolve to solve the crime and bring a killer to justice. >> make no mistake we will get to the bottom of this.#smq

we will find out who did this. >> it is tuesday, april 16th.7sf >> announcer: from abc news, this is "world news now" with john muller and diana perez.:ói dozens of investigators will be pouring over the crime scene trying to figure out who placed the bombs. >> they're thought small crudely made devices hidden in backpacks, planted during the race or prior to and detonated remotely possibly with a cell phone. coverage begins live in boston with abc's marci gonzalez. good morning, marci. let's get started on this one, marci. tell us about the investigation as it unfold this morning. what are some of the lead the investigators are following? >> good morninglx%á% john, dian. as you said investigators believe it was two small home made bombs that killed three people including an 8-year-old boy. and injured more than 140

others. ñ heightened here boston. as investigators still have not named a suspect. [ explosion ] >> reporter: the first explosion went off near the finish line of the boston marathon four hours into the race. >> something just blew up. second later, another explosion nearby. >> i literally saw the garbage barrel explode. i saw the flash, the fire, the smoke. >> reporter: complete chaos followed. blood covered t#0 injured people everywhere. those who could, ran for cover. >> this cowardly act will not be taken in stride. we will turn every rock over to find the people who are response bum for this. >> reporter: police and emergency crews scrambled to attend to the transported in wheelchairs and gone at the knees, ankles and

feet missing. shrapnel wound to the side of the head. >> reporter: joining forces to find out who is responsible for this carnage. >> it is a criminal potential on that is, has , terrorist investigation. >> reporter: theerç marathon the country. and the governor is asking the public to be on alert. >> we are also asking that everyone be on a state of heightened vigilance. that is really required of everyone. >> reporter: we are told investigators are questioning a person of interest, but that person is not kiddconsidered a suspect at this point. john, diana, pack to you. >> marci, what can people expect tomorrow as they retur yesterday's state holiday in massachusetts. can you talk to us a little bit about the security? >> well there will absolutely be

heightened security. a lot of the roads will remain closed as the investigation continues. people who use mass transit can expect random bag searches. again the message. they're urging people to be vigilant and report anything suspicious they see. >> marci, so many victims, some estimates 140 being treated with injuries. what stand out in your mind about the bloodshed and these numbers? >> oh, yeah, yeah, more than 140 people injured. absolutely devastating. you think these are runners who left the race, so many of them, without one or both of their legs. you think)z3 came many of them to cheer on their parents. and were severely injured. what really hit me about this, is that the last mile of the race was dedicated to the victims of the newtown tragedy. and now here we are yet another devastating display of violence here in our country that we are marci gonzalez

reporting live for us in boston. >> all right, the president and top lawmakers closely watching the developments from boston as the investigation unfolds. abc's jonathan karl reports from the white house. >> reporter: top congressional leaders who have been briefed on the investigation say that it bears all the hallmarks of a terrorist attack. senator dianne feinstein, the chairwoman of the senate intelligence committee, told abc news' jeff zeleny, "it could be foreign, it could be home grown, but it is terrorism." the president in his remarks to the country did not to that word. >> we still do not know who did this or why. and people shouldn't jump to conclusions before we have all the facts. but, make no mistake we will get to the bottom of this. and we will find out who did this. we'll find out why they did this. any responsible individuals, groups, will feel the full weight of justice. >> i asked senior administration

officials about that. what i was told was, quote, any event with multiple explosive devices as this appears to be is clearly an act of terror and should be approached as an act of terror. but the administration makes it clear this is still an ongoing investigation. very little is known. there is no information about whether or not this is conducted by an organized terror group. whether a domestic terrorist group or international group. that's why they have bane cautious in the language they have been using and the president. jonathan karl, abc news, the white house. >> half a million spectators lined the boston marathon route yesterday. thousand of them were crowded into the race's final stretch where the bomb blast went off. one of the spectators was abc news producer kendall heath. >> my brother-in-law and i were watching at the corner of boylston street where the runners take the final left towards the finish line. as we were watching, all of a

sudden you hear and feel a large explosion. and see white smoke. this plume of smoke, 20, 30 feet high go up in the air. about, 5, 10 second later, fold low by another explosion the i saw a fire ball and smoke into the air. chaos ensued. folks realized something was wrong. began to smell like sulphur. runners were diverted. confused not knowing to continue. police came on to the scene. and got to the finish line as soon as they could. police officers directed everyone off the street, wanted to clear boylston street. stopped the runners. tried to get pedestrians off the street. a lot of folks ran toward the explosion. trying to help. and many eyewitness reports of those trying to help. >> police are minding the route of boston, the streets for the marathon any way. moments ament larry. trying to help those injured. >> that was kendall heath. if you are traveling to day you

may notice stepped up security at the nation's airports. here in new york so-called critical response teams along with 1,000 counterterrorism officers have been sent to high profile locations. police with bomb sniffing dogs have been searching the mare your airports. in los angeles, police could put more patrols to work in the transit system after the boston bombings. at lax the scene of the failed bomb attempt, security was beefed up. spectators saw more security last night at the dodgers game. >> relatively easy to increase security at airports and main your destinations keeping big events secure. that presents major challenge to law enforcement. abc's david kerley has more on this. >> reporter: the bloody boston explosion, shattered the marathon and reopened wound in this country. this attack far from the first targeting civilians. international terrorists tried to bring down the trade center in '83. the blast withstood and six were

killed. the oklahoma city bombing in '95 killing 168. so similar to the boston blast, the atlanta olympics bombing in '96. spectators gathered in a park when a bomb went off. it is the soft target terrorists are looking for. >> these setting, marathon, football, football, social event, are targets. you can't get around it. >> reporter: tom ridge was the country's first secretary of homeland security. >> you have to manage the risk. unless you have information about a particular actor. you can't guarantee safety anywhere. >> though police are in duty with plenty of national guard soldiers some one was able to place two gomz. >> what can we do if we are at a large event is there anything i can do to keep myself safe? >> if you see something, slogan is, say something. about being aware of your

environment. if it looks unusual. tell something abit. a -- about it. >> best advice. don't let them affect your life. go back and live your life. >> live your life. when you compromise how you live that gives them a victory. as painful as it is to day. you can't let them succeed by us changing the norm and how we live. can't let them win. no victories. >> i think the last point is so important. you can't let them win. can't say i will not go to the ball game because of what if? that's what they want. >> that's what they want. they want you to stay home and watch this coverage and be too scared to do anything. you have to go out and live your life. important clues, for as chaotic as that look. there are important clues of behind the -- >> the injured. if anybody has hand injuries. some one could be using bomb make mag terl and residue on

their hants. >> this shrapnel and things that could have come from the device itself. >> that's right. and pierre thomas is reporting what they want to see is how was it detonated, remotely detona detonated, with a cell phone, right there, remote control. what did they use? how was it toed? that clue will probably lead them or at least hoping it will lead them to the person or group that did this. >> yes. coming up the unforgettable accounts from eyewitnesses. >> the fear in their voices and look in their eyes, after seeing something so unthinkable. >> later the 78-year-old marathon runner knocked down by the bomb impact. . unforgettable image, and his remarkable story. you're watching a special edition of "world news now." ay. >> good. you know, i'm really glad we got this insurance. dad taught me so much, especially how important it is to protect the ones you love. these policies will help

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welcome back. coverage of the terror at the boston marathon continues. >> the toll of yesterday's tragedy in deaths and injuries is no doubt horrific. but the emotional effects of those who were there and saw it will linger for a long time. here's what the people who were there, who lived through this tragic event experienced. >> it kind of was look a bomb,

what a bomb would sound like. absolutely horrifying. >> very loud. the ground shook. you could just feel it going down through you. [ screams ] >> the explosion went off at the finish line. the boom. you felt it. it hurt your ears. >> something just blew up. >> run! go! >> i saw a trash can explode. people started throwing down the barricade. and running over each other. i ran, in the other direction fast as i could. >> i would in the city. this is like the scariest thing i ever experienced. people were trying to get away from the scene. as far away. people were walking across the bridge like an exodus to cambridge. >> i saw runners in front of me fall, stunned, some from injuries. then i looked over and saw just a pile of bodies. the worst thing i think i have sign my life. mangled limbs. people not breathing i just interviewed a nurse here on

scene who said she treated dozens of people including children. many people with severe trauma, you name it. >> they responded within 15 second. you saw everybody coming down here. the medical team responded instantly. >> i am a college student in monday, patriots day monday, you never think anything like this will happen in boston off the awe you hear and see the picture. it gets you so disheartened about humanity on some level. then you see the people running and how heroic they are, and you realize people are good. >> yeah, running toward the explosion. >> yes, right. >> you know we are getting a lot of reaction out of this obviously. something we are getting is international reaction. coming in what we have gotten from pakistan. pakistan governmenter ud a statement today that said, condemned this heinous act of terrorism in the strongest

possible terms and hope the perpetrators of this barbaric act will be brought to justice. they're not the only ones, prime minister, david cameron, scenes from boston are shocking, horrific, my thoughts with all of those who have been affected. >> all right. when we return we'll take a look at other top headlines this tuesday. >> the fight for immigration reform and the deal expected to day on capitol hill. you are watching "world news now."

turning away from our top story and other headlines this morning. beginning with immigration reform the a new bill introduced by a bipartisan group of senators today include billions of dollars to secure the u.s. border with mexico. a billion and a half dollars will go toward building new border fences. supporters of rewriting the nation's immigration laws gathered at capitol hill yesterday to put pressure on lawmakers. >> make sure that they hear from you that they know without a

doubt in their mind that keeping their jobs depend on them supporting comprehensive immigration reform. >> what we are seeing right now is an incredible amount of support from the left and the right. >> the new proposal also puts millions of illegal immigrants on a path to citizenship. but only if they arrived in the u.s. before the end of 2011. those who have been charged with crimes, would not be eligible. president obama will host south korea's first female president at the white house next month. they will observe the 60th anniversary of the alliance between the u.s. and south korea. also high on their jenn, efforts to counter the nuclear threat pose by north korea. in venezuela demand for a recount, ballots were ignored leading to an anti-government protest. the election results were certified. the winner by a razor thin margin is the hand picked president by late hugo chavez.

following the boston bombings, scotland yard is beefing up the already extraordinary security measures in place for margaret thatcher's funeral tomorrow. hundred of military troops will be visible along the procession route through the streets of london. and with so many dignitaries that are expected to attend services including queen elizabeth and former prime minister, scotland yard is fine tuning itsenes security operation as well. all right. when wall street opens this morning. traders will be trying to shack o -- shake off the worst lossesen a year. the economic slowon in china brought on selling. lost 266 points. almost 2%. other may jr. averages were down. the biggest drop for stocks since early november. >> right now we'll take a look at your tuesday weather. stormy from texas to ohio with hail and wind as high as 70 miles per hour. afternoon showers from vermont to pittsburgh.

thunderstorms in southern florida. rain in the north west. mountain snow in the northwest as well. later into the dakotas. >> thrmid 60s in the north east. 80s in the south. >> still ahead our coverage of the boston marathon attack continues. >> when we return we'll hear from a survivor of the bombings, a 78-year-old man knocked down by the blast. like it has for so many people before. do not take lunesta if you are allergic to anything in it. when taking lunesta, don't drive or operate machinery until you feel fully awake. walking, eating, driving or engaging in other activities while asleep without remembering it the next day have been reported. lunesta should not be taken together with alcohol. abnormal behaviors may include aggressiveness, agitation, hallucinations or confusion. in depressed patients, worsening of depression, including risk of suicide, may occur. alcohol may increase these risks. allergic reactions such as tongue or throat swelling occur rarely and may be fatal.

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of the leading bargain brand. bring it. bounty basic. those images of horror in boston will stay with for us a long time. there is one that has been replayed over and over that captured the precise moment when a triumphant run ended and kay ys began. >> a 78-year-old runner knocked to the ground by the blast feet away from the finish line. he survived and wasn't hurt. we hear his story from linsey davis. >> reporter: it is an image that

stays with you at the moment of the explosion, bill igfrid knocked to the ground surround by smoke 15 feet shy of the finish line of what would be his third boston marathon finish. >> i could see the finishing ramp. when i got within about 15 feet. just a horrendous explosion occurred. i didn't know where at the time. >> could you see it or hear it. he approached the finish line, 3:50 after he finished the race in the middle of the pack. he was feeling great until the unexpectedly collapsed. >> my whole body was crumbling like. and i was going down. and boy, this is going to beat end of me. my last trip. i didn't have any idea what was going on. >> reporter: the 78-year-old then crossed the finish line aided by volunteers and walked six blocks become to his hotel not sure what had just happened. >> i figure that was some kind of bomb went off. [ explosion ] i didn't really know what to

think? >> which way was the finish line, this way? >> the finish line was this way. >> the bomb was behind me. yeah. i didn't think about any possibility of another bomb going off up by the finish line. and then after i was up and walking over, then the other bomb went off. it was loud. i mean really loud. my whole ear drums when i got back i couldn't hardly here anything. tremendous. >> a story of tragedy and triumph for bill, far more than finishing a race is happy to be here to talk about it. >> good bless him and the people of boston. >> you got that right. we leave you this half-hour an image that shows hope. >> the building at mit lit to resemble the american flag, the symbol of resilience of the american people. stay tuned for more coverage from abc.

terror at the boston marathon. twin explosions shatter celebration, turning a day of joy into a deadly nightmare. >> i literally saw the garbage barrel explode. i saw a flash of fire, the smoke. i ran as fast as i could. >> the finish line of the iconic event a scene of horror. >> i looked over and saw just a pile of bodies, the worst thing i think i have ever seen in my life. >> this morning, fierce resolve

solve the crime and bring a killer to justice. >> make no mistake we will get to the bottom of this. we will find out who did this. >> it is tuesday, april 16th. >> announcer: from abc news, this is "world news now" with john muller and diana perez. and good morning. it was a day that was supposed to be a celebration with one of the nation's longest running sporting events at its core. >> the boston marathon always getting plenty of attention, unfortunately this year it is for all the wrong reasons. [ explosion ] >> that was the sound that runners, fans and those provide providing support near the marathon's finish line heard yesterday when the explosions went off. one witness called the aftermath more like baghdad than boston. >> at this hour, 100, perhaps 150 people reported injuries. many of the injuries grave. at least three people have died. the national guard is securing the crime scene.

while the fbi leads the investigation and the search for suspects. >> a massive effort under way this morning to find out who was responsible for the deadly attack. >> fragments in the exploded bombs will be key to determining how crude devices were put together. abc's senior justice correspondent pierre thomas following the investigation. >> reporter: it is dramatic videos like this and this, captured at the scene of the horrific blast investigators will be combing through for clues of what happened. two bombs exploding within seconds of each other. and only 100 yards apart. the bombs were small, portable devices. that could have been carried in a backpack, easily concealed among the thousands of spectators. that's what makes this investigation so difficult. authorities say there are no suspects, the bombs caused terrible injuries and hospitals reported seeing shrapnel wounds. >> there is, a lot of small metal debris. some people have -- have asked already about whether these were

bbs or they were parts of bombs. i just don't think we are able to say whether these are small bits of metal placed intentionally or part of the environment. >> reporter: shrapnel is just one of the clues investigators will be looking at. >> there are fragments everywhere, there are fragments everywhere, there are fragments within the victims. fragments in the sidewalk. what they're going to be able to do is probably reconstruct the timer device, what was used, they're going to look at the components of the bomb, able to tell them is this just somebody that put this together over the internet or is this a bomb maker? >> hundreds of state and federal investigators have descended on boston to try to find out who could have built the bombs and set them off. >> there are federal, state and local law enforcement all on scene and coordinating closely. the fbi has taken charge of the investigation. >> reporter: this type of attack has long been law enforcement's worst fear, a soft target where suspects can easily blend in and inflict mass casualties.

the boston marathon is a heavily policed event. more than 500 national guard troops were on scene as well as members of the boston police and fire departments. but that did not prevent this from happening. >> anyone can walk up to the sidelines on the stretch of boylston street, anybody can get off the subway, bicycle in and walk down and walk up to the lines where this bomb took place. it would be impossible to screen everybody along the 26-mile route of a marathon. >> reporter: cities around the nation now on high alert. bomb-sniffing dogs patrolling the streets of chicago. airports in washington and new york, stepping up their security. in new york, the stepped up police presence could be seen everywhere. police cars lined the streets in times square. which itself was the scene of an attempted bombing in 2010. that was only foiled when a

local vendor alerted police about a suspicious car. the attack is one of many targeting u.s. civilians. in 1993, terrorists targeted the world trade center killing six people. two years later in 1995, the oklahoma city bombing. 168 people killed in that attack. and the horrific events of 9/11. thousands killed. still seared into memory. investigators are just starting to comb through the evidence. collecting the security camera video from the scene. searching for any clues about who could have done this and why? >> the fbi, boston police, massachusetts state police, will be going over all of the videotapes from that entire neighborhood, looking to see if there was some one suspicious, if there was some one they recognize doing facial recognition analysis and facial software to see who was there. >> i'm pierre thomas in washington. >> the very latest live from boston a city dealing with shock.

>> abc's marci gonzalez is there this morning. marci, good morning. any late details from investigators? >> reporter: good morning, john and diana. we are told investigators are questioning a person of interest. boston police will only say that they are talking to several people. but abc news has learned that among those people being talked to is a 20-year-old man who is being treated in a hospital here for injuries. but again, no confirmation on, if this is the person of interest that we are hearing about. and this person we are told is not considered a suspect at this point. we expect to learn more when the fbi holds a press briefing later this morning. >> marci, let's talk about security, a day off, holiday, patriots' day in massachusetts. tomorrow, back to school. back to work. what kind of, today, actually, of course, what kind of added security can we expect? >> well, boston public schools are actually off for the week

for spring break. so that -- that is good news at this point. for those going to work, they can expect a lot of road closures. we saw a lot of roads closed as we came into boston a few hours ago. those taking mass transit can expect random bag searches, the national guard is here, extra officers on duty. the big message they're sending out to people in boston is to just to be extra vigilant. if anyone sees a package or anything suspicious, just a reminder to report it. >> marci, there were just so many victims taken to so many of the hospitals in boston. can you speak of how chaotic this must have been for the victims their loved ones, even the first responders? >> oh, absolutely chaotic. we saw in some of the videos that, while most people ran away there were those who ran toward the explosion to help the injured. we are hearing stories of people

who, who brought children down to the ground and actually laid on top of them to try to shield them from the debris that was going everywhere. and we're hearing that the youngest victim who is being treated in the hospital right now is just 2 years old. john, diana. >> abc's marci gonzalez reporting live this morning from boston. thank you. our coverage of the terror at the boston marathon does not end here. later this half-hour, an explosives expert offers some key insight into the investigation. stay with abc news all morning long for the latest developments. other major headlines in dallas. the outcome of a wild police chase there and a standoff with a man accused of shooting and killing his pregnant girlfriend. police pursued tyrone allen in the streets until his car hit the curb and ran into a house. he barricaded himself inside for four hours. he finally surrendered. allen's girlfriend was 6 months pregnant their unborn baby also did not survive. sweeping bill to reform the nation's immigration system will be introduced ed td today on c

hill and includes billions to secure the u.s. border with mexico. a billion and a half will go toward building border fences and would put millions of illegal immigrants on a path to citizenship only if they arrived in the united states before the end of 2011. those who have been charged with crimes would not be eligible. >> stocks on major asian markets are trading lower this morning after wall street suffered its worst day of the year. fears about an economic slowdown in china were the main reason for the dow's nearly 266-point plunge yesterday. that is nearly 2%. the tragedy in boston didn't help investors' confidence. the nasdaq down 2.5%. >> coming up, when we return, our top story, we'll go to the tragedy at the boston marathon. >> we are getting new insight o the finish line. stay tuned as we interview an expert on the bombs coming up live. >> and the bombing put police in new york and other big cities on high alert almost instantly. how first responders are ready for the worst and the security you can expect across the country. you are watching "world news now." is something you see a smell.

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investigators begin to piece together the details of the attack at the boston marathon. they're asking the public to share videos and pictures of the scene. >> the images, smallest details of those pictures, will help piece together this crime. joining us to talk more about this, former detective with nypd bomb squad, kevin berry.

thank you for joining us this morning. we really do appreciate it. our first question is, what might investigators learn from the device they discovered that was unexploded? we want to get through the question quickly. we have a very interesting picture to show everyone. >> well, to do it quickly. the information i have heard recently is the unexploded device was not a device, in fact, it -- it was not. had it been there might have been good evidence recovered. but right now -- [ explosion ] >> could you say that one more time. we are having a hard time hearing you. >> the most updated information i have is what they thought was a recovered device was not, but just a knapsack containing property. >> okay. >> kevin, let's move on. looking at photographs of investigators, in specialized suits, combing through the scene. you have taken an extensive look at the pictures and your

expertise on some of these. bring to light what you may see going on in the pictures? >> the investigators in, bomb suits, 100 layers of kevlar, 100 pounds apiece, they're searching for represent nants mnants, witt there may be in the area. fully encapsulated. also see an object blue in the center of the picture. the blue object is sitting in the seat of the explosion. it was not there at the time of explosion. may have been pulled into the hole by a negative blast wave after the original explosive wave went outward, a negative wave pulls objects back into the scene of the seat of the explosion. >> kevin, what is it that they're, and we also see a very dark mark, seems to be on the sidewalk, why is that significant? why would investigators be looking at the mark on the

sidewalk? >> that is a thermal burn mark caused by the thermal ball that you saw in the explosive video followed by the smoke cloud going upward with white smoke. on the ground you will see in front of the two windows, about 20 feet across and 2 feet from the building line outward toward the curb, a white substance. >> yeah, we see it. talk about it. what are we looking at in your opinion? >> my opinion, that may be unexploded tertiary explosive, eerie nitrate, similar to the '93 bombing of the world trade center, or ammonium nitrate, the explosives need a booster to speed up the work effect of the explosive to make it function. it appears from what i see, a possibility that this bomb was bigger than actually we thought at first. but it failed to function as design. it didn't have enough energy to create a work effect of the

explosive product. it didn't function fully. >> thank goodness if that is in fact the case. mr. berry, we want to thank you for your expertise. thank you for joining this morning. we appreciate you joining us this morning. >> hour's welcome. good night. >> good night. >> all right, coming up. when we come back, we will go back to boston and talk about explosions and how they impacted security there. >> from coast to coast, how big cities are now putting safety first. you are watching "world news now." >> announcer: "world news now" continues after this from our abc stations.yw97í7

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aw, man. yeahh... well. have a good one. you're a nice lady. immediately after the boston bombings cities throughout the nation have heightened security. >> in los angeles extra transit officers are added to patrol buses and trains. the city added extra security for the dodgers baseball game. >> chicago police also stepped up security at sporting events. the city added extra police patrols at the blackhawks game among many other places. on public transportation, amtrak, officers increased sweeps of stations and train tracks. >> in new york city where the

fear and reality of terrorism is all too real. city leaders took no chances. >> major landmarks in the city were closely guarded. and officers were a visible presence in city streets and subways. more now from abc's carolina leed. >> reporter: minutes after the blasts in boston word spread quickly here in lower manhattan with many clinging to social media for updates including wesley webb whose family lives near boston city center. >> just like not being there, not knowing exactly what is happening. step by step. it is just like, okay. hold up. let me take a breather. make sure everybody is okay. >> reporter: nypd stepped up security focusing resources on hotels and prominent locations. mayor michael bloomberg says critical response vehicles are monitoring the city. and officials are watching live feeds from the nypd's high-tech camera network in congested areas. >> here in new york city, we immediately took steps to prepare for the possibility of a related attack.

there is nothing we know that it is going to happen, but we-to be prepared. ç stood heavily armed officers carrying automatic weapons. in lower manhattan, police peeked in cars. on the west side highway, new yorkers were yet again confronted with more evidence of this heightened police presence. >> very nervous. very nervous. i was a part of september 11th. yeah, stuck on the ground at exchange place. so the was eerie feeling. >> reporter: mayor michael bloomberg says there are 1,000 people assigned to counterterrorism and all of them have been deployed. and it will stay that way until we learn more about the boston explosions. reporting in times square, carolina leed, abc news, new york. -- "an eerie feeling." >> that's right.

new york was one of several places that were heavily secured and patrolled by almost everybody. they and we are talking about london, also, a marathon coming up. >> marathon coming up. april 21st. >> washington, d.c., transit police were out in force. and they created a perimeter around the white house, just to make sure. there were no, nobody said anything was going to happen. just wanted to make sure. >> cities around the nation kind of tense this morning. coming up personal insight into the tragedy. >> unforgettable images from the past day in boston. you are watching a special edition of "world news now." [ female announcer ] crest plus scope celebrates the daring ones.

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on the wings of lunesta. such an emotional day for the people of boston and the entire nation and all of us. your impressions, diana? >> i worked in boston at cbs station, wbz for a while. and you know the city comes alive when the marathon is happening. this really is a special time for the city. to see this happen to such a wonderful group of people. because working there, they embraced you almost immediately. and this is such a tragic event.

i will say this boston is the type of town they don't like to be messed with they absolutely, they're tough people. they are resilient. i know they will come back stronger. of all the places for this to happen. boston is known for its world class hospitals. so you know they were prepared for something like this. they're getting the best treatment that they could get. >> my experience watching this obviously, the obvious feelings of just shock and horror and sadness all that. but social media struck me. i just got on twitter recently. we talked about that on the show. i wept -- i went right to it. i got lots and lots of updates. it is really amazing how that works during a crisis like this. also, on my facebook page. most of my friends, tend to be from new york where i live. and seeing them say, love to boston. boston we love you. boston in our prayers, made me realize how the rest of the country must have felt about new york on september 11th. we love boston. we're all from boston. >> on a day like today we are.

there were cameras at the marathon to capture the moment of triumph. >> no surprise the pictures of the attack were truly startling from the moments the bombs exploded to the chaos and aftermath, it was all caught -- stung stunning images that day. ♪ ♪

terror at the boston marathon from celebration to chaos. >> terror strikes america's oldest show of competitive spirit, a deadly display of hate which turned scenes of joy into visions of war. >> we saw the first bomb go off. people -- i'm sorry -- in the streets. >> i saw one guy with his legs gone at the knees and some ankles and feet missing. >> this morning a vow to catch the killer and the nation's highest office. >> any responsible individuals, any responsible groups will feel